This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 16 |
| 3 | 41 |
| 4 | 94 |
| 5 | 203 |
| 6 | 424 |
| 7 | 869 |
| 8 | 1762 |
| 9 | 3551 |
| 10 | 7132 |
| 11 | 14297 |
| 12 | 28630 |
| 13 | 57299 |
| 14 | 114640 |
| 15 | 229325 |
| 16 | 458698 |
| 17 | 917447 |
| 18 | 1834948 |
| 19 | 3669953 |
| 20 | 7339966 |
| 21 | 14679995 |
| 22 | 29360056 |
| 23 | 58720181 |
| 24 | 117440434 |
| 25 | 234880943 |
| 26 | 469761964 |
| 27 | 939524009 |
| 28 | 1879048102 |
| 29 | 3758096291 |